I don't know if this helps any, but http://www.forgottenoh.com/Cemeteries/campchase.html
says "A cemetery was established at the Camp near the end of 1863. The Confederate dead who had been buried in the city cemetery were moved back to Camp Chase.".....I would surmise that he was simply not exhmed and moved with all the others, but I bet you already knew that!!!

I tried to "google" a roster of Camp Chase prisoners, which one would think should be easy to find; however, all I could come with is a list of burials, of which, I didn't find Matthew Nathan Ford. I don't know why there is not a list of all prisoners, living or deceased, anywhere....

Kenneth, I bet you tried everything I just mentioned, but I thought I'd look anyway! Good luck with your search and please let us know what you find out!!